0.000892 to 1 significant figure is 0.0009 (1st significant figure is the first non-digit from the left, where in this case you can omit the number 2 since it will make no difference to the answer)
0.5
It's already there.
12
10920 to 1 significant figure is 10000
470 rounded to one significant figure is 500
654 rounded to one significant figure becomes 700.
It is 0.01
7000
2,000,000
0.9
0.1
9000
10000000
800
200
100
round to the first significant figure
I think your question is asking how you would round 17.521 to the nearest number with 1 significant figure...if that's the case, it would round to 10.